EP 0404830 A4 19920812 - ANNULAR FLUORESCENT LAMP
Title (en)
ANNULAR FLUORESCENT LAMP
Publication
Application
Priority
US 16666288 A 19880311
Abstract (en)
[origin: US4833574A] Improved performance and compact size in an annular fluorescent lamp are achieved by providing two or more annular glass tube sections disposed one above another and connected to provide a single arc discharge path from a filament at one end of the lowermost tube section to a second filament at one end of the uppermost tube section. These multi-layer fluorescent lamps are particularly well suited for use in conjunction with internal reflectors, and with internal and external reflectors. The internal reflector may serve as a housing, or as part of a housing, for associated electrical components.
IPC 1-7
IPC 8 full level
F21S 2/00 (2006.01); F21S 8/00 (2006.01); H01J 61/32 (2006.01); H01J 61/33 (2006.01); H01J 61/72 (2006.01)
CPC (source: EP US)
H01J 61/322 (2013.01 - EP US); H01J 61/72 (2013.01 - EP US); F21Y 2103/33 (2016.07 - EP US)
Citation (search report)
- [Y] US 4225905 A 19800930 - MORIYAMA HIDEO, et al
- [A] BE 456963 A
- [A] US 2406146 A 19460820 - HOLMES JOHN E
- [A] US 3646383 A 19720229 - JONES CLIFTON P, et al
- [A] DE 1272449 B 19680711 - ALFRED WALZ DR ING
- PATENT ABSTRACTS OF JAPAN vol. 7, no. 154 (E-185)(1299) 6 July 1983 & JP-A-58 064 747 ( TOKYO SHIBAURA DENKI K.K. ) 18 April 1983
- See references of WO 8908801A1
Designated contracting state (EPC)
AT BE CH DE FR GB IT LI LU NL SE
DOCDB simple family (publication)
US 4833574 A 19890523; EP 0404830 A1 19910102; EP 0404830 A4 19920812; JP H03503464 A 19910801; WO 8908801 A1 19890921
DOCDB simple family (application)
US 16666288 A 19880311; EP 89904405 A 19890310; JP 50387789 A 19890310; US 8900981 W 19890310